Bronzing-machine.



W. A. McCLELLAND.

BRONZING MACHINE.

1,266,134. APPLICATION FILED JULY 22, I914 Patented 14:,

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BRONZING MACHINE.

APPLICATION FILED JULY 22. [914.

Patented Mayl 1918.

2 SHEETS-SHEET 2 {fix 436655 affarneya WILLIAIE A. MCCLELLAND, 0F RIDGEWOOD, NEW JERSEY.

BRONZING-IVIACHINE.

Specification of Letters Patent.

Patented May 14, 1918.

Application filed July 22, 1914. Serial No. 852,338.

To all whom it may concern:

Be it known that I, WILLIAM A. MoCLEL- LAND, a citizen of the United States, residing at Ridgewood, New Jersey, have invented certain new and useful Improvements in Bronzing-lllachines, of which the following is a clear, full, and exact description.

This invention relates to bronzing machines, and one of the objects of the invention is to provide means in the nature of a dust collector for minimizing, if not entirely preventing the spreading of the fine powder into the air in the neighborhood of the machine or into the room in which the work people are operating. A still further object of the invention is to provide practical and eflicient means for preventing the spreading of dust or fine powder.

These being among the objects of the present invention, the same consists of certain features of construction and combinations of parts to be hereinafter described and then claimed with reference to the accompanying drawings showing a suitable embodiment of the invention, and in which Figure 1 is a front elevation partly in section of so much of a bronzing machine as is necessary to illustrate the present improve. ment;

Fig. 2 is a plan view;

Fig. 3 is an enlarged vertical central section of the funnel-shaped main air cham her and of a supplemental or relief chamber; and

Fig. i is an enlarged plan view of the same. 7

Referring to the drawings, Figs. 1 and 2, the casing 10 of the machine contains such parts for instance as a cylinder 11 over which the sheet to be bronzed is conducted in a well known manner, and above which is located a drawer or receptacle 12 for the supply of bronze powder which is sifted onto the sheet through a screen 13. A combined suction fan and blower 14 is located to one side of the machine and is connected to the lower part of the casing 10 by a short pipe 15, while from the discharge end of said blower there leads a pipe 16 which, at its upper end is connected with the upper end of a funnel-shaped head or hopper 17 which constitutes an air chamber. As shown, the discharge end of the pipe 16 is connected with the enlarged portion of the tapering air chamber 17 and dischar es a blast of air tangentially into said cham r. The blower takes the surplus bronze from within the casing 10 and blows it into the air chamber 17, so that there is dust laden air entering the said air chamber tangentially. Parts such as described are known in the art.

Under the present invention, the action of the blower upon the dust laden air causes the same to form a whirl within the air chamber 17, the bronze powder or the like being thrown against the inner wall of the air chamber, with the lighter particles to ward the center. However, under the pres ent invention, the parts are so disposed and constructed that little if any of the bronze powder will escape with the air through the central outlet opening 18 which is formed by a short section of tubing 19 which depends from an annular top-plate 20, so that the said air chamber is closed at the top except for the blast opening and the air outlet opening 18. The action is such that most of the air freed from the powder is discharged upwardly through the opening 18 while the powder is projected in a whirl against the inner wall of the air chamber and falls under the action of gravity down the said wall and through a contracted aspiration opening 21 at the projecting lower end of the said air chamber. There is aslight suction hardly appreciable at said opening 21.

Supported above the casing 10 is a box or supplemental chamber 22 more fully shown in Figs. 1 and 3 and which is adapted to constitute a relief chamber. It is preferably constructed of a suitable metal frame 23. the walls of which are formed by trans parent plate-glass 2a, or the said relief chamber may be constructed in any other suitable manner. The transparent walls permit a view of the inside of said relief chamber. Preferably the upper, portion of the relief chamber is of rectangular forma tion while the lower portion 25 tapers to a discharge opening 26 for sending the sur plus powder backto the supply at 12. As before stated, the surplus bronze powder falls down the air chamber 17 in a whirl and it issues from the aspiration opening 21 in a spiral column directed toward the dis- ,charge opening 26. Usually the lower end of the column backs up toward the discharge opening 26 about as indicated in Fig. 3. Relief for some of the air in the air chamber 17 which has not passed out through the opening 18 is found within the" relief chamber 22, said chamber relieving the air pressure while it does not prevent the discharge of the surplus powder spirally toward the discharge opening 2t). A neck 27 is located at one side of the relief chamber 22 and onto it there is screwed a removable cap 28, so as to provide means for cleaning the inside of the glazed portions of said relief chamber.

There is located within the air chamber 17 toward and at a point just above the aspiration opening 21 a disk-like deflector or batflaplate 29 which is supported in position by means of a hanger rod 30. This rod preferably extends axially through the air outlet opening 18 and is supported within. said opening by, means of spider frames or the equivalent 31, 3-2. Said rod 30 is not permanently secured to the supporting frames 31 and 32, but preferably has a sliding connection therewith so that the height of the deflector 29 above the contracted opening 21 may be regulated, and this also regulates the size of the annular space around the said deflector. The size of said annular space depends upon the speed of the; blower, for if the speed of the latter be made greater, the size of said annular space is to be made smaller and vice versa.

Obviously the invention is susceptible of modification as parts may be omitted, parts added, and parts substituted without departing from the scope and spirit of the invention.

What I claim as new is 1. In a machine of the class described, the combination of a casing in which may be placed a sheet to be coated with pulverulent material, blower and suction means, a relief chamber provided with an upper. aspiration opening, restricted in size with respect to said chamber, said chamber having a permanently open discharge opening below said aspiration opening and leading to said casing, and means connected with said aspiration opening for producing, with the as sistance of said aspiration opening, a vorteX of said pulverulent material within said chamber, said means comprising a tapering air chamber connected with said blower means and at the lower end of which said aspiration opening is located, said suction means being connected with said casing for withdrawing the surplus pulverulent mate rial therefrom.

'2. In a machine of the class described, the combination of a relief chamber provided with an upper aspiration opening, restrict ed in size with respect to said chamber, said chamber having a free and unobstructed, permanently open, discharge opening below said aspiration opening, means connected with said aspiration opening whereby, with the assistance of said openings there is produced a vortex of pulverulent material within said chamber, said means comprising a tapering air chamber, which at its lower end projects into said relief chamber, and in which lower end said aspiration opening is located, and which is provided with an upper air outlet opening, and means for withdrawing the said pulverulent material through said discharge opening and from said relief chamber, together with a supply receptacle provided with a screen subjected to the suction action of said withdrawing means and into which said discharge opening opens and delivers the said material directly.

3. In a machine of the class described, the combination of a relief chamber provided with an upper aspiration opening and a lower discharge opening,,both restricted in size with respect to said chamber, and said discharge opening being free and unobstructed, a container for a supply of pulverulent material. to which said; discharge opening leads. and means for sending a spiral column of pulverulent material through said aspiration opening and said discharge opening, whereby the material from said column is discharged into said container, the said means adapted also to withdraw pulverulent material from. said container, and cause it. to be transferred back to said. relief chamber.

at. In a machine of the class described, the combination of a relief chamber having at its lower end a downwardly tapered portion with a glazed wall for purposes of observa tion, and provided with an upper aspiration opening and a lower discharge openin both restricted in size with respect to said chamber, and-said discharge opening being located at the contracted end of said tapered portion, and means for sending a spiral column of pulveru-lent material through said aspiration opening and said discharge open- Signed at New York, N. Y. this 18th day of July 191d.

WILLIAM A. h lcGLELLAN D.

Witnesses Gno. L. Wnnntocn, F. JACKSON.

gender, of this patent maybe obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. U. 

